Originally Posted by alpine-al

I plan to stay with the stock exhaust and I'm hoping the 2015 PCA regulations (and the various regional PCA classifications) will allow me to race autocross in a "stock/street" class. Even a minor mod like the SW bypass could bump a GT3 into a different class and have to compete against highly modified cars (as opposed to racing other stock 997/991 GT3s and Turbos). I know that my buddies in the local PCA regions would love to get the 991 GT3s into their own class in 2015. We'll see...


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Originally Posted by neuroguru

This is a center muffler delete unit like Sharkwerks, et al.

$1700 was the old model cost for the 997.2GT3

The RSS GT3 XPIPE CENTER EXHAUST (3rd Muffler/Resonator Delete). Intoxicating sound with an aggressive look. For Porsche GT3 & GT3RS Automobiles.

• 3” Lower & 2” Upper 304 Stainless Steel Construction
• Large 3 3/8” 304 Stainless Steel Dual Tailpipes Included (welded on)
• Available with Straight Cut Tips (Part#1203) or Angle Cut Tips (Part#1204)
• Ceramic Coated Satin Black
• Intoxicating Sound
• All Hardware (clamps) Included
• Weighs Only 8 Pounds
• Fits All 997.1 GT3/GT3RS & 997.2 (2010+) GT3/GT3RS Models

http://rss.rpmware.com/rss/rss-gt3-x.../i-291991.aspx

The 991GT3 version is about to be released and I hear it sounds even better, though that is 'hear' in the sense of hearsay, not hear via my ear!

Originally Posted by neuroguru

This is a center muffler delete unit like Sharkwerks, et al.

$1700 was the old model cost for the 997.2GT3

The RSS GT3 XPIPE CENTER EXHAUST (3rd Muffler/Resonator Delete). Intoxicating sound with an aggressive look. For Porsche GT3 & GT3RS Automobiles.

• 3” Lower & 2” Upper 304 Stainless Steel Construction
• Large 3 3/8” 304 Stainless Steel Dual Tailpipes Included (welded on)
• Available with Straight Cut Tips (Part#1203) or Angle Cut Tips (Part#1204)
• Ceramic Coated Satin Black
• Intoxicating Sound
• All Hardware (clamps) Included
• Weighs Only 8 Pounds
• Fits All 997.1 GT3/GT3RS & 997.2 (2010+) GT3/GT3RS Models

http://rss.rpmware.com/rss/rss-gt3-x.../i-291991.aspx

The 991GT3 version is about to be released and I hear it sounds even better, though that is 'hear' in the sense of hearsay, not hear via my ear!

Originally Posted by Money2536

I'm pretty sure the side exhaust gases still travel through the side mufflers in addition to opening a direct route to exit. So when the valves are closed, gases travels through the side mufflers then out. When the valves are open, gases still travel through the side mufflers but an additional direct route is opened. Removing the side mufflers equals super loud.